Proguard returned with error code 1. See console java.io.IOException: Can't write [/private/var/folders/mr/4s8s9y_n4s311bbppxmbtrsh0000gn/T/android_1758031694879942813.jar] (Can't read [/.../JakeWharton-ActionBarSherlock-e5c2d1c/library/bin/abs.jar] (Unexpected end of ZLIB input stream)) ... Caused by: java.io.IOException: Can't read [/.../JakeWharton-ActionBarSherlock-e5c2d1c/library/bin/abs.jar] (Unexpected end of ZLIB input stream) ... Caused by: java.io.EOFException: Unexpected end of ZLIB input stream
Proguard を 4.8 にアップデートすると直るらしい。
もしくは、コピペしないで手で入力したらエラーにはならなかった。